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Caffeine, Dietary supplements, Ergogenic effects
Introduction: The purpose of this study was to evaluate the independent and combined effects of energy drink (ED) functional ingredients, caffeine (CAF), taurine (TAU), and glucose (GLU) on 5-km running time trial (5KTT) performance in recreational endurance runners.
Methods: Twenty recreational endurance runners (10 men, 10 women, 21.3 ± 2.2 years) participated in a double blind, placebo controlled, repeated measures study. In the first session subjects completed the 5KTT without consuming a drink (control trial - CON). Subjects were then randomly assigned to supplement with 500 ml of a commercially available ED, CAF (160 mg), TAU (2g) and GLU (54g) 60 minutes before completing a 5KTT on a treadmill; separated by seven days. Time, heart rate, RPE, and affect were recorded at 500-m intervals during the time trial (TT). Session RPE and session Affect were obtained post TT.
Results: TT performance did not differ across conditions (CON: 1420 ± 161.4 s; ED: 1409.3 ± 153.1 s; CAF: 1414.9 ± 163.2 s; TAU: 1427.7 ± 178.8 s; GLU: 1416.2 ± 167.7; p = .80). HR and RPE increased wile affect decreased during the TT, irrespective of the substance ingested (all p > 0.05). Session RPE was significantly higher in the ED trial (8.1 ± 1.1) compared to GLU (7.7 ± 1.2), TAU (7.5 ± 1.3) and CON (7.5 ± 1.3) but not CAF (7.8 ± 1.3) (p = 0.025).
Conclusions: The present data does not unequivocally support an ergogenic potential of a popular ED above that of CAF, TAU, and GLU, if consumed sixty minutes before exercise in men and women recreational distance runners.
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